Industrial Furnaces Classification & Heat Losses Calculation

FurnacesMain Topics:IntroductionTypical Furnace SystemTypes of Continues Reheating FurnacesHeat LossesEfficiency Calculations (Direct & Indirect)IntroductionFurnaceDevice used to provide heat for an industrial processHeat materials for change of shapeChange of properties (heat treatment).Melt metals for casting678TYPES AND CLASSIFICATION OF DIFFERENT FURNACESBased on the method of generating heat, furnaces are classified into two types namely-Combustion type (using fuels) -Electric type.9In case of combustion type furnace, depending upon the kind of combustion, it can be broadly classified as oil fired, coal fired orgas fired. Based on the mode of charging of material furnaces can be classified as(i) Periodical furnace.(ii) Continuous furnace1112Continuous furnace13Periodical furnace14Recuperativefurnace15regenerativefurnaceBased on mode of waste heat recoveryas recuperativeand regenerativefurnaces.161718Characteristics of an Efficient FurnaceFurnace should be designed so that in a given time, as much of material as possible can be heated to a uniform temperature as possible with the least possible fuel and labour. To achieve this end, the following parameters can be considered.19Determination of the quantity of heat to be imparted to the material or charge.20Liberation of sufficient heat within the furnace to heat the stock and overcome all heat losses.21Transfer of available part of that heat from the furnace gases to the surface of the heating stock.22Equalization of the temperature within